CN218944704U

CN218944704U - Two-stage absorption and desorption device

Info

Publication number: CN218944704U
Application number: CN202223197057.4U
Authority: CN
Inventors: 褚怡涵; 符亚玮; 雷洁琼; 肖函
Original assignee: Suzhou Pusai Environmental Technology Co ltd
Current assignee: Suzhou Pusai Environmental Technology Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-05-02
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a two-stage absorption and desorption device which comprises an absorption tower with a lower liquid collecting box in the lower section and a desorption tower with an upper liquid collecting box in the upper section, wherein the tower bottom of the absorption tower is communicated with the tower top of the desorption tower through a rich liquid pipeline I, and one side of the desorption tower is communicated with the lower liquid collecting box of the absorption tower through a semi-lean liquid pipeline corresponding to the upper liquid collecting box; one side of the absorption tower is communicated with the lower liquid collecting box corresponding to the lower liquid collecting box through a rich liquid pipeline II, and the tower bottom of the desorption tower is communicated with the top of the absorption tower through a lean liquid pipeline. According to the utility model, the absorption tower and the desorption tower are respectively divided into the pre-absorption/coarse desorption and the main absorption/fine desorption two circulation systems by arranging the liquid collecting box, so that not only can the absorption effect be obviously improved by sectional absorption, but also the coarse desorption process is to carry out coarse desorption on the pre-absorption rich liquid by additionally utilizing the gas at the top of the desorption tower, and no new energy consumption is added, but also the fine desorption load of the desorption tower on the main absorption rich liquid is reduced by pre-absorption, so that the energy consumption of the system is reduced.

Description

Two-stage absorption and desorption device

Technical Field

The utility model belongs to the technical field of tail gas treatment or gas purification devices, and particularly relates to a two-stage absorption and desorption device.

Background

Flue gas is a gaseous substance that is produced by burning fossil fuels such as coal and is polluting to the environment, and these substances are usually discharged from a flue or a chimney. The process of flue gas generation is mostly caused by underutilization of fuel and incomplete combustion. The components of the gas are nitrogen, carbon dioxide, oxygen, water vapor, sulfides and the like, and the existing absorption and desorption flow is to absorb the sulfides in the flue gas through the absorbent in the absorption tower to purify the gas, and then to strip and desorb the sulfides in the absorbent through the desorption tower. The absorption and desorption in the above process are often single-stage, the absorption rate needs to be further improved, and the energy consumption of the system needs to be further reduced.

Disclosure of Invention

The utility model aims to provide a two-stage absorption and desorption device which improves the absorption rate and simultaneously saves energy consumption.

The technical scheme adopted by the utility model is as follows: the two-stage absorption and desorption device comprises an absorption tower with a lower liquid collecting box in the lower section and a desorption tower with an upper liquid collecting box in the upper section, wherein the tower bottom of the absorption tower is communicated to the tower top of the desorption tower through a rich liquid pipeline I, and one side of the desorption tower is communicated to the lower part of the lower liquid collecting box of the absorption tower through a semi-lean liquid pipeline corresponding to the upper liquid collecting box; one side of the absorption tower is communicated with the lower liquid collecting box corresponding to the lower liquid collecting box through a rich liquid pipeline II, and the tower bottom of the desorption tower is communicated with the top of the absorption tower through a lean liquid pipeline.

The present utility model is also characterized in that,

the upper liquid collecting box and the lower liquid collecting box comprise horizontal partition boards, the upper parts of the centers of the partition boards are fixedly communicated with a gas lifting pipe, and the upper parts of the top end openings of the gas lifting pipe are fixedly connected with liquid baffle plates through longitudinal connecting rods.

The flue gas pipeline is communicated with the absorption tower below the position where the absorption tower is communicated with the semi-lean liquid pipeline.

The top of the absorption tower is communicated with a purified gas pipeline.

The top of the desorption tower is communicated with a reflux tank through a pipeline through a condenser, the bottom end of the reflux tank is communicated with the top of the desorption tower through a pipeline, and the top end of the reflux tank is communicated with a desorption pipeline.

And the rich liquid pipeline II and the lean liquid pipeline are communicated with a lean-rich liquid heat exchanger.

The tower bottom of the desorption tower is communicated with a reboiler through a pipeline.

The semi-lean liquid pipeline is provided with a cooler I.

And a cooler II is arranged at one end, close to the top of the absorption tower, of the lean liquid pipeline.

The beneficial effects of the utility model are as follows: according to the two-stage absorption and desorption device, the absorption tower and the desorption tower are respectively divided into the pre-absorption/coarse desorption and the main absorption/fine desorption two circulation systems by the liquid collecting box, so that the absorption effect can be obviously improved by sectional absorption, and the coarse desorption process is to carry out coarse desorption on the pre-absorption rich liquid by additionally utilizing the gas at the top of the desorption tower, so that new energy consumption is not increased, and the pre-absorption reduces the fine desorption load of the desorption tower on the main absorption rich liquid, thereby reducing the energy consumption of the system.

Drawings

FIG. 1 is a schematic diagram of a two-stage absorption and desorption apparatus according to the present utility model.

In the figure, the lower header tank 1, the absorber tower 2, the upper header tank 3, the desorption tower 4, the rich liquid pipeline I, the semi-lean liquid pipeline 6, the rich liquid pipeline II, the lean liquid pipeline 8, the flue gas pipeline 9, the clean gas pipeline 10, the condenser 11, the reflux tank 12, the desorption pipeline 13, the lean rich liquid heat exchanger 14, the reboiler 15, the cooler 16, the cooler I, the cooler II, the rich liquid pump 18, the rich liquid pump I, the rich liquid pump 19, the lean liquid pump II, the lean liquid pump 20 and the reflux pump 21.

Detailed Description

The utility model will be described in detail with reference to the accompanying drawings and detailed description.

The utility model provides a two-stage absorption desorption device, which is shown in figure 1, and comprises an absorption tower 2 with a lower liquid collecting box 1 arranged in the lower section and a desorption tower 4 with an upper liquid collecting box 3 arranged in the upper section, wherein the upper liquid collecting box 3 and the lower liquid collecting box 1 respectively comprise horizontal partition boards, a riser is fixedly communicated above the centers of the partition boards, gas phases below the partition boards can rise to the upper parts of the partition boards along the riser, liquid phases falling above the partition boards are collected outside the riser of the partition boards, and liquid baffle plates are fixedly connected above the top end openings of the riser through longitudinal connecting rods to prevent the liquid phases falling above the partition boards from falling below the partition boards through the riser. The tower kettle of the absorption tower 2 is communicated to the tower top of the desorption tower 4 through a rich liquid pipeline I5, a rich liquid pump I18 is arranged on the rich liquid pipeline I5, the upper part of a baffle plate of an upper liquid collecting box 3 corresponding to one side of the desorption tower 4 is communicated to the lower part of the lower liquid collecting box 1 of the absorption tower 2 through a semi-lean liquid pipeline 6, a cooler I16 is arranged on the semi-lean liquid pipeline 6, a flue gas pipeline 9 is communicated with the lower part of the absorption tower 2, which is positioned at the communication position of the flue gas pipeline 9 and the semi-lean liquid pipeline 6, and a purified gas pipeline 10 is communicated with the tower top of the absorption tower 2. The separator of the lower liquid collecting box 1 is correspondingly arranged above one side of the absorption tower 2 and is communicated to the lower part of the upper liquid collecting box 3 of the desorption tower 4 through a rich liquid pipeline II 7, a rich liquid pump II 19 is arranged on the rich liquid pipeline II 7, the tower bottom of the desorption tower 4 is communicated to the top of the absorption tower 2 through a lean liquid pipeline 8, a lean liquid pump 20 is arranged on the lean liquid pipeline 8, the rich liquid pipeline II 7 and the lean liquid pipeline 8 are jointly communicated with a lean-rich liquid heat exchanger 14, and a cooler II 17 is arranged on the lean liquid pipeline 8, which is close to one end of the top of the absorption tower 2. The top of the desorption tower 4 is communicated with a reflux tank 12 through a pipeline through a condenser 11, the bottom end of the reflux tank 12 is communicated with the top of the desorption tower 4 through a pipeline through a reflux pump 21, and the top end of the reflux tank 12 is communicated with a desorption gas pipeline 13. The tower bottom of the desorption tower 4 is communicated with a reboiler 15 through a pipeline.

During operation, flue gas to be treated enters the lower part of the lower liquid collecting box 1 of the tower kettle of the absorption tower 2 through the flue gas pipeline 9, and gas-liquid mass transfer is carried out on the flue gas with semi-lean liquid introduced in the semi-lean liquid pipeline 6, so that the flue gas is pre-absorbed, the pre-absorbed rich liquid exits the tower kettle of the absorption tower 2 and enters the top of the desorption tower 4 through the rich liquid pipeline I5 under the action of the rich liquid pump I18, the pre-absorbed flue gas enters the upper part of the lower liquid collecting box 1 through the riser, gas-liquid mass transfer is carried out on the pre-absorbed flue gas with the lean liquid absorbent introduced in the lean liquid pipeline 8, so that main absorption is carried out on the flue gas, and other light components of the sulfur in the flue gas exit the tower through the purified gas pipeline 10 after the pre-absorption and main absorption.

The pre-absorption rich liquid entering the top of the desorption tower 4 is roughly desorbed by the gas at the top of the desorption tower 4, wherein the pre-absorption rich liquid is primarily desorbed by the desorption gas originally coming out of the top of the desorption tower 4, the semi-lean liquid is obtained by desorption, the semi-lean liquid is collected on a baffle plate of the upper liquid collecting box 3, and is cooled by the cooler I16 and then is sent back to the lower section of the absorption tower 2 by the semi-lean liquid pipeline 6 to be used for absorbing the primary flue gas coming in from the flue gas pipeline 9. The desorbed gas obtained by desorption is discharged from the tower and condensed by a condenser 11 into a reflux tank 12, the non-condensable gas is discharged by a desorption gas pipeline 13, and the condensed liquid phase is returned to the top of the desorption tower 4 by a reflux pump 21. The flue gas is subjected to main absorption, then main absorption rich liquid collected on a partition plate of a lower liquid collecting box 1 enters the lower part of an upper liquid collecting box 3 of a desorption tower 4 through a rich liquid pipeline II 7 under the action of a rich liquid pump II 19 to be subjected to fine desorption, a reboiler 15 provides a heat source, lean liquid entering the tower bottom of the desorption tower 4 after fine desorption is subjected to heat exchange with the main absorption rich liquid through a lean-rich liquid heat exchanger 14 and then is cooled through a cooler II 17, and the lean liquid enters the tower top of an absorption tower 2 through a lean liquid pipeline 8 under the action of a lean liquid pump 20, so that the pre-absorbed flue gas is subjected to main absorption.

Through the mode, the two-stage absorption and desorption device provided by the utility model divides the absorption tower 2 and the desorption tower 4 into the pre-absorption/coarse desorption and the main absorption/fine desorption two circulation systems respectively through the liquid collecting box, so that the absorption effect can be obviously improved through sectional absorption, in addition, the coarse desorption process is to carry out coarse desorption on the pre-absorption rich liquid by additionally utilizing the gas at the top of the desorption tower 4, no new energy consumption is added, and the pre-absorption reduces the fine desorption load of the desorption tower 4 on the main absorption rich liquid, so that the energy consumption of the system is reduced.

Claims

1. The two-stage absorption and desorption device is characterized by comprising an absorption tower (2) with a lower liquid collecting box (1) arranged in the lower section and a desorption tower (4) with an upper liquid collecting box (3) arranged in the upper section, wherein the tower kettle of the absorption tower (2) is communicated to the top of the desorption tower (4) through a rich liquid pipeline I (5), and one side of the desorption tower (4) is communicated to the lower part of the lower liquid collecting box (1) of the absorption tower (2) through a semi-lean liquid pipeline (6) corresponding to the upper liquid collecting box (3); one side of the absorption tower (2) is correspondingly communicated with the lower liquid collecting box (1) below the upper liquid collecting box (3) of the desorption tower (4) through a rich liquid pipeline II (7), and the tower bottom of the desorption tower (4) is communicated with the top of the absorption tower (2) through a lean liquid pipeline (8).

2. The two-stage absorption and desorption device according to claim 1, wherein the upper liquid collecting tank (3) and the lower liquid collecting tank (1) comprise horizontal partition boards, a riser is fixedly communicated above the center of each partition board, and a liquid baffle is fixedly connected above the top opening of each riser through a longitudinal connecting rod.

3. A two-stage absorption and desorption apparatus according to claim 1 wherein the absorber (2) is provided with a flue gas duct (9) in communication with the semi-lean liquid duct (6) below the location of communication therewith.

4. A two-stage absorption and desorption apparatus according to claim 1, wherein the top of the absorption tower (2) is connected with a purge gas pipe (10).

5. The two-stage absorption and desorption device according to claim 1, wherein the top of the desorption tower (4) is communicated with a reflux tank (12) through a pipeline through a condenser (11), the bottom end of the reflux tank (12) is communicated with the top of the desorption tower (4) through a pipeline, and the top end of the reflux tank (12) is communicated with a desorption gas pipeline (13).

6. A two-stage absorption and desorption apparatus according to claim 1, wherein the rich liquid pipeline ii (7) and the lean liquid pipeline (8) are commonly communicated with a lean-rich liquid heat exchanger (14).

7. A two-stage absorption and desorption apparatus according to claim 1, wherein the tower bottom of the desorption tower (4) is communicated with a reboiler (15) through a pipeline.

8. A two-stage absorption and desorption apparatus according to claim 1 wherein the semi-lean liquid conduit (6) is provided with a cooler i (16).

9. A two-stage absorption and desorption apparatus according to claim 1, wherein a cooler ii (17) is provided on the lean liquid pipe (8) near the top of the absorption tower (2).